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Alloy 625 / 2.4856
Alloy 625 is a low carbon (0.03%) nickel-chromium-molybdenum-niobium alloy which has excellent corrosion resistance to a wide range of corrosive media. Alloy 625 is normally supplied in annealed condition for wet corrosion applications and is TÜV-approved for pressure vessels in the temperature range from -196°C to 450°C. In annealed condition (grade 1) Alloy625 is characterized by:
Material Data Sheet
| Material Designation | 2.4856 |
| Alloy | Alloy 625 |
| EN Material Symbol | NiCr22Mo9Nb |
| UNS | N 06625 |
| VdTÜV Data Sheet | 499 |
Main fields of application of alloy 625
2.4856 is used for:
- Natural gas pipelines
- Production systems and pipe coverings of riser pipes in oil production
- Preparation of phosphoric acid
- Shipbuilding and marine water lines
- Plants for the treatment of radioactive waste
- Flue gas scrubbers and dampers in flue gas cleaning systems
Chemical composition of alloy 625
| C | Si | Mn | P | S | Cr | Mo |
| % | ≤ % | ≤ % | ≤ % | ≤ % | % | % |
| 0.03 | 0.4 | 0.5 | 0.01 | 0.01 | 21.0-23.0 | 8.0-10.0 |
Characteristics of alloy 625
| Temperature Range | Wet corrosion and high-temperature variant possible |
| Density | 8.44 g/cm³ |
| Melting Range | 1290°C - 1350°C |
| ISO-V notch impact toughness (average at room temperature acc. to DIN EN 10045 part 1) | lengthwise ≥ 125 J/cm² |
| across ≥ 100 J/cm² |
Filler metal (for welding with alloy 625)
Welding rods and wire electrodes:
Nicrofer S 6020 - FM 625 (2.4831)
DIN EN ISO 18274: S Ni 6625 (NiCr22Mo9Nb)
UNS N06625
AWS: 5.14: ErNiCrMo3
Covered electrodes:
DIN EN ISO 14172: E Ni 6625 (NiCr22Mo9Nb)
(2.4621)
UNS W86112
AWS A5.11: ENiCrMo-3
